Douglas F4D Skyray
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The American Douglas F4D Skyray (later redesignated F-6 Skyray) was a carrier-based fighter built by the Douglas Aircraft Company. Although it was in service for a relatively short time and never entered combat, it was notable for being the first carrier-launched aircraft to hold the world's absolute speed record  and was the first United States Navy fighter capable of exceeding Mach 1 in level flight.
The Skyray was designed to meet a Navy requirement issued in 1947 for a fighter aircraft capable of intercepting and destroying an enemy aircraft at an altitude of 50,000ft (15,240m) within five minutes of the alarm being sounded. The Navy also wanted an aircraft which followed the designs and research of the German aerodynamicist Alexander Lippisch who moved to the U.S. after World War II.
The F5D Skylancer was a cancelled development of the F4D Skyray.
Design and development
The F4D Skyray was a wide delta wing design with long, sharply swept, rounded wings. The design was named after the Manta ray fish which it resembled.  The thick wing roots contained the air intakes feeding a single turbojet engine. Fuel was contained both in the wings and the deep fuselage. Leading-edge slats were fitted for increased lift during takeoff and landing, while the trailing edges were mostly elevon control surfaces. Additional pitch trimmers were fitted inboard near the jet exhaust, and were locked upward on takeoff and landing.
The Westinghouse J40 turbojet was the intended power plant, but Douglas fortunately took a conservative view and designed in contingency options for other power plants. The J40 proved troublesome and was eventually cancelled, and the Skyray was fitted instead with the Pratt & Whitney J57, a more powerful but larger engine.
Production aircraft were not delivered until early 1956, while the U.S. Marine Corps received their first in 1957. In total, 419 F4D-1 (later designated F-6 in the unified designation system) aircraft were produced.
Its unique and notable looks also played a part in making the Skyray one of the best-remembered early jet fighters. Affectionately known as the "Ford" (after the "Four" and "D" of its designation),  this aircraft had a spectacular rate and angle of climb and set a new time to altitude record. It saw the Skyray fly from a standing start to 49,221 feet (15,000 meters) in 2 minutes and 36 seconds, all while flying at a 70 degree pitch angle. 
- In 1953 Edward H. Heinemann was awarded the Collier Trophy in recognition of his design work on the F4D.
A derived successor, the F5D Skylancer, was designed and prototypes were built and flown, but the project was cancelled as being too similar in mission parameters to the Vought F8U Crusader and also to reduce dependence upon Douglas Aircraft, which was also producing several other aircraft for the US Navy. 
In April 1956 VC-3 was the first squadron operational with the F4D-1. This unit was later redesignated VFAW-3 and assigned to NORAD, as the only US Navy squadron. VFAW-3 was permanently based at NAS North Island, San Diego. The US Marine Corps also flew the Skyray. When the Skyray was redesignated F-6A in September 1962, only VFAW-3, VMF-114, VMF-513 and VMF(AW)-542 flew the type together with the reserve squadrons VMF-215, VF-881 and VF-882. The last operational squadron was VMF(AW)-542 which used the Skyray until February 1964.
The Skyray was designed exclusively for the high-altitude interception role and was unsuited to the multi-mission capabilities soon in demand, so it had a short life in Navy and Marine Corps service, the last aircraft being withdrawn from service in 1964. Four aircraft were used by NACA (soon to be NASA) until 1969.
- Prototypes, redesignated YF-6A in 1962, two built
- Single-seat fighter aircraft, production model redesignated F-6A in 1962, 420 built.
- Re-engined F4D-1 with the J57-F-14, 100 on order cancelled.
- F4D-2 version with extended nose housing twin radar scanners, project only evolved into the F5D Skylancer.
- XF4D-1 prototypes redesignated in 1962.
- F4D-1 redesignated in 1962.
With the new joint services designations the Navy/Marine designations were replaced (which included a manufacture letter code), the F4D was redesignated the F-6A. The lower numbers were due to the fighter series being reset back to F-1 (after having gone up to F-111) under the 1962 United States Tri-Service aircraft designation system.
Possible confusion: The F4D (old designation) should not be confused with the F-4D (new designation) - the latter being the "D" variant of the McDonnell F-4 Phantom II.
- NACA /NASA
- The sole-surviving XF4D-1 (BuNo 124587) is on display at the U.S. Naval Museum of Armament and Technology, China Lake.
- An F4D-1 (BuNo 134806) is part of the collection preserved at the National Museum of Naval Aviation 
- F4D-1 (BuNo 134748) is on loan from the Museum of National Aviation and is on display at the Pima Air and Space Museum in Arizona.
- An F4D-1 (BuNo 134936) is part of the collection at the Pueblo Weisbrod Aircraft Museum 
Data from: The American Fighter 
- Crew: 1
- Length: 33 ft 6 in (10.21 m)
- Wingspan: 45 ft 3 in (13.8 m)
- Height: 13 ft 0 in (3.96 m)
- Wing area: 557 ft² (52 m²)
- Empty weight: 16,024 lb (7,268 kg)
- Loaded weight: 22,648 lb (10,273 kg)
- Max. takeoff weight: 27,116 lb (12,300 kg)
- Powerplant: 1 × Pratt & Whitney J57-P-8, -8A or -8B turbojet
- Maximum speed: 722 mph (627 kts, 1,200 km/h)
- Range: 700 mi (610 NM, 1,100 km) combat
- Ferry range: 1,200 mi (1,040 NM, 1,900 km)
- Service ceiling: 55,000 ft (17,000 m)
- Rate of climb: 18,300 ft/min (93.3 m/s)
- Wing loading: 41 lb/ft² (198 kg/m²)
- Thrust/weight: 0.71
- Guns: 4× 20 mm (0.787 in) Mk 12-0 cannons in wing roots, 65 rounds/gun
- 6 pods of 7× 2.75 in (70 mm) unguided rockets or
- 4 pods of 19× 2.75 (70 mm) unguided rockets
- Missiles: 2× AIM-9 Sidewinder air-to-air missiles
- Bombs: 2× 2,000 lb (910 kg) bombs
- APQ-50A radar
- Aero 13F fire-control radar
Aircraft of comparable role, configuration and era
- List of fighter aircraft
- List of military aircraft of the United States
- List of military aircraft of the United States (naval)
- Angelluci, 1987. p. 92.
- Angelluci, 1987. p. 91.
- Gunston,1981. p. 67.
- Gunston,1981. p. 70.
- National Aeronautic Association, Collier Trophy awards Retrieved 27 February 2008
- Gunston,1981. p. 73.
- Museum of Naval Aviation, F4D-1 Retrieved: 27 February 2008.
- Pima Air and Space Museum, F4D-1 Retrieved: 27 February 2008.
- Pueblo Weisbrod Aircraft Museum Retrieved: 29 February 2008.
- Angelucci, Enzo. The American Fighter. Sparkford, Somerset: Haynes Publishing Group, 1987. ISBN 0-85429-635-2.
- Green, William and Pollinger, Gerald. The Aircraft of the World. London: Macdonald, 1955.
- Gunston, Bill. Fighters of the Fifties. Cambridge, England. Patrick Stephens Limited, 1981. ISBN 0-85059-463-4.
- Posey, Carl. "Beautiful Climber". Air & Space June-July 2006, 66:73.
- Williams, Nick and Ginter, Steve. Douglas F4D Skyray, Naval Fighters no. 13. Simi Valley, California: Ginter Books, 1986. ISBN 0-942612-13-4.
- Winchester, Jim, ed. "Douglas F4D Skyray." Military Aircraft of the Cold War (The Aviation Factfile). London: Grange Books plc, 2006. ISBN 1-84013-929-3.
- Winchester, Jim. Fighter - The World's Finest Combat Aircraft - 1913 to the Present Day. New York: Barnes & Noble Publishing, Inc. and Parragon Publishing, 2006. ISBN 0-7607-7957-0.
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